原标题：英语小短文练听力 彩虹

A rainbow

is a circle of colors that appears（[??p??z]呈现） in the sky when sunlight shines on raindrops（[?re?ndr?ps]雨滴）. The sunlight and water work together to form rainbows. Think of sunlight flowing out in many lines, called rays. The

rays are an equal distance from each other. The light energy of the rays acts similar to waves, which have different lengths. Sunlight is made up of severalwave lengths（波长）. People see the mix of lengths as what is called white light. But things change when a ray of white light hits a raindrop. That is when the colors that make up white light slow to different speeds. The light bends（曲折

） as it enters the raindrop. This bending separates（使别离） the white light into colors, each color weakening as it moves into the next color. The light rays turn or bend again when they come out of the raindrop. This

continuous（[k?n?t?nju?s]不断的） bending through an area of raindrops is what makes the rainbow a perfect circle.回来搜狐，查看更多

责任修改：